First 140 mm Fan Roundup: Noctua, Phanteks, Xigmatek

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Noctua NF-A15 PWM

The NF-A15 PWM is very similar to the NF-A14 FLX with the most noticeable difference being a larger octagonal frame and more heavily curved struts. The impeller and blades are exactly the same as the A14 and the specifications are similar to the FLX except this model has PWM capability.

It appears as though the fan's oddly squared off top and bottom serve only as mounting points for Noctua's fan dampeners.

We don't know the advantages of this semi-octagonal frame but the higher curvature of the struts should reduce tonality compared to the A14. The fan itself looks identical.

The A15 is strikingly similar to Thermalright's TR-TY140.

Specifications: NF-A15 PWM
Manufacturer Noctua Power Rating 0.96 W
Model Number NF-A15 PWM Airflow Rating 115.5 m³/h
88.7 m³/h with L.N.A
Bearing Type SSO2 Speed Rating 1,200 RPM
900 RPM with L.N.A
Frame Size 150 x 140 x 25 mm
(120 mm holes)
Noise Rating 19.2 dBA
13.8 dBA with L.N.A
Hub Size 42 mm Header Type 4-pin
Blade Diameter 133 mm Fan Mounts Isolators or screws
Cable Length 20 cm Weight 160 g
Starting Voltage 6.0 ~ 6.5 V Number of Samples 1
Corner Type Open Retail Availability Yes
Accessories: 8 cm LNA (low noise adapter), 30 cm extension cable, 10 cm Y-cable, isolators, screws.

This is the screen capture of Fan Xpert 2's auto-analysis of the NF-A15 PWM.

Acoustic analysis of the NF-A15 PWM.

SPCR Test Results: NF-A15 PWM
Fan Speed (RPM)
Thermal Rise (°C)
Airflow in/out (FPM)

The A15 had a more pleasant pitch than the A14, especially at full speed where it produced more of a buzzing rather than a droning sound. At lower speeds, it was noticeably smoother as well, though we could detect some faint fluttering close up, as if something inside the motor was off balance. The A15 does indeed sound superior to the A14 but the old P14 still sounds better yet.

We also only had one sample of the NF-A15 PWM, so for all we know, the improvement in noise quality is a fluke. That being said, what we heard was perfectly in line with expectations given the physical structure of the frame.

While the A15 sounded better, its cooling performance was exactly the same at each of the tested speeds. The measured noise level was also very close.

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